JP5127803B2 - In-furnace equipment transfer apparatus and in-furnace equipment transfer method - Google Patents

Description

  The present invention relates to an in-furnace equipment transfer device for taking out an in-furnace device such as a control rod, a fuel support fitting or a control rod guide tube from a boiling water reactor and transferring it to various pools, and a furnace using this device. The present invention relates to an internal device transfer method.

  In general, when performing in-reactor inspection work or maintenance work inside the reactor, equipment inside the reactor such as a control rod (CR), fuel support bracket (FS), or control rod guide tube (GT) is taken out from the reactor building. This is done after temporarily storing it in the spent fuel pool. Hereinafter, these control rods, fuel support fittings or control rod guide tubes will be collectively described as in-furnace equipment.

  However, in recent years, the number of equipment stored in the spent fuel pool and stored for a long time has increased, and it has become difficult to secure a space for installing a temporary rack for storing in-furnace equipment.

  In order to cope with this, conventionally, for example, a two-tier temporary rack has been installed in the cask cleaning pool area attached to the spent fuel pool to increase the number of units accommodated, or the spent fuel pool wall surface has been used for storage. Improving the temporary rack, such as installing a temporary rack at a height that does not interfere with the equipment, or storing it in the temporary rack of the equipment storage pool without storing it in the temporary rack of the spent fuel pool, Measures are taken to change the storage location.

  By the way, it is difficult for the temporary rack improved as described above to directly store the in-furnace equipment taken out of the furnace due to the lifting height, and once it is installed in the temporary rack for normal use, the suspension work is performed. This is the current situation. Since it is necessary to carry out this suspension work, there is a problem that the construction period increases accordingly.

  Also, when removing multiple in-furnace equipment from the furnace, recording paper such as check sheets handwritten on-site is used, but the in-furnace equipment can be installed at any position in the furnace due to its structure. Therefore, even if an operator installs it by mistake, it is difficult to notice because there is no sense of incongruity in the installation work, and the management number stamped on the device cannot be easily confirmed without using an underwater camera or the like.

  When managing with a recording sheet such as a check sheet handwritten on-site as described above, it is considered that the operator is likely to cause an erroneous operation, and means for preventing an erroneous operation using an apparatus or system has been studied. Its application is desired.

  In addition, as a method for removing and attaching the control rod, as in the method disclosed in Patent Document 1, for example, the connection between the control rod using the bayonet coupling and the control rod drive mechanism can be released and reconnected. There is a way.

JP-A-5-164484

  By the way, in the background art mentioned above, in order to take out the in-core equipment from the inside of the furnace, the work is performed in the vicinity of the core support plate that becomes the core bottom. If the well pool is filled with water in the furnace as in the case of fuel exchange, the vicinity of the core support plate has a water depth of about 25 m. Then, in order to take out the in-furnace equipment, it is necessary to suspend the dedicated jig from the operation floor to the position and then hold the in-furnace equipment with the dedicated jig.

  An upper grid plate installed at the center height of the core is used for alignment and positioning of this special jig. Specifically, the conventional guide member (grid guide) used for alignment and positioning is slightly longer than the fuel rod, and supports the lattice of the upper lattice plate that supports the upper portion of the fuel rod. The structure reaches the position where the in-furnace equipment is installed. By using this guide member, the in-furnace equipment can be easily detached and attached from the inside of the furnace.

  However, the in-furnace equipment removed from the furnace is moved to the upper rack of the two-stage temporary rack described above, the wall-mounted temporary rack of the spent fuel pool, or the temporary rack installed in the equipment storage pool for temporary placement. Then, because the dedicated jig and the guide member are mounted on it, the lifting height of the small hoist such as the auxiliary hoist of the fuel changer or the silver hoist (trade name) connected to the auxiliary hoist is insufficient. Therefore, it has been necessary to temporarily place it in a temporary rack in the spent fuel pool, remove the guide member, and then move it to the improved temporary rack described above. Therefore, there is a problem that the construction period increases.

  Also, when removing multiple in-furnace equipment from the furnace, the main coordinate of the refueling machine is used to record the horizontal coordinate position for removal from the furnace and the horizontal coordinate position of the temporary rack as computer control operations. It is also possible to display the recording result, which is effective as a method for preventing an error caused by the operator.

  However, since the main mast of the refueling machine is a device that handles fuel originally, the length of the main mast extends only to the position of the upper grid plate where the upper part of the fuel rod can be grasped. At present, the main mast of the refueling machine does not reach the core support plate where the in-furnace equipment is installed, even if it is extended the most. On the other hand, even if the main mast is shortened to the shortest, the main mast rises only about 1 m from the operation floor, so that a jig and a guide member for grasping the upper portion of the fuel rod cannot be attached to the tip of the mast.

  The present invention has been made to solve the above-described problems, and allows a guide member, a movable member, and a gripper to be attached to the suspension means of the fuel exchanger outside the reactor, while the core support plate is attached to the reactor inside the reactor. The installed in-furnace equipment can be securely grasped, and it is not necessary to temporarily place the grabbed in-furnace equipment, and it can be transferred from the furnace to various pools without interfering with gates, racks, etc. With the goal.

  In order to achieve the above object, a device for transferring an in-core device according to the present invention is detachably suspended from a first suspension means attached to a fuel exchanger in a reactor building and formed on an upper lattice plate. A guide member that can be guided and passed through the rectangular opening, and a movable member that is suspended by a second suspending means attached to the fuel exchanger and is movable along the vertical direction of the guide member. And a gripping tool fixed to the lower part of the guide member and gripping the in-reactor equipment installed on the core support plate, and when the guide member, the movable member and the gripping tool are outside the furnace, The distance between the movable member and the gripping tool is reduced, and when the guide member, the movable member, and the gripping tool are in a furnace, the distance between the movable member and the gripping tool is increased.

  In order to achieve the above object, an in-core equipment transfer method according to the present invention is an in-core equipment transfer method for taking out in-core equipment installed on a core support plate through an upper lattice plate when the reactor is shut down, A guide member that can be guided through a rectangular opening formed in the upper lattice plate, a movable member that is movably attached along the vertical direction of the guide member, and a gripping tool fixed to the lower portion of the guide member. When the in-furnace equipment transfer device is outside the furnace, the guide member and the movable member are attached to the refueling machine by reducing the distance between the movable member and the gripping tool. A suspension step for suspending each of the movable member, and after the suspension step, when the guide member, the movable member, and the gripping tool are suspended in the furnace, A passing step in which a gap with respect to the gripping tool is enlarged to pass through a rectangular opening formed in the upper lattice plate, a gripping step of gripping the in-furnace device with the gripping tool after the passing step, and a gripping step And a take-out step of pulling up the second suspension means to take out the in-furnace equipment, and a transfer step for transferring the in-furnace equipment to various pools after the take-out step.

  According to the present invention, it is possible to attach a guide member, a movable member and a gripping tool to the suspension means of the fuel exchanger outside the nuclear reactor, while securely grasping the in-core equipment installed on the core support plate in the reactor. It is not necessary to temporarily place the in-furnace equipment that has been grabbed, and it can be transferred from the furnace to various pools without interfering with gates and racks. Efficiency can be greatly increased.

It is a perspective view which shows the state which extended 1st Embodiment of the instrument for apparatus transfer in a furnace which concerns on this invention. It is a perspective view which shows the state which shrunk | reduced the apparatus for apparatus transfer in a furnace of FIG. FIG. 2 is an enlarged plan view showing a state in which the in-furnace equipment transfer tool of FIG. 1 uses an upper lattice plate as a guide. It is a longitudinal cross-section block diagram which shows the state which removes an in-furnace apparatus using the apparatus for in-furnace apparatus transfer of FIG. It is a longitudinal cross-section block diagram which shows the state which removes an in-furnace apparatus using the instrument for in-furnace apparatus transfer of FIG. 1, and transfers to the temporary rack installed in the apparatus storage pool. It is an enlarged plan view which shows the state which the apparatus for in-furnace apparatus transfer which concerns on 2nd Embodiment of this invention used the upper lattice board as a guide. It is a schematic longitudinal cross-sectional view which shows the state which has arrange | positioned the apparatus for in-furnace apparatus transfer in the fuel exchanger vicinity in 2nd Embodiment of the in-furnace apparatus transfer method which concerns on this invention. It is a schematic longitudinal cross-sectional view which shows the state which hold | gripped the instrument for apparatus transfer in the furnace of FIG. 7 with the main hoist of the fuel exchanger. It is a schematic longitudinal cross-sectional view which shows the state which advanced the refueling machine and extended the apparatus for apparatus transfer in a furnace. It is a schematic longitudinal cross-sectional view which shows the state which rotated the main mast of the refueling machine. It is a schematic longitudinal cross-sectional view which shows the state which extended the main mast of the refueling machine. It is a schematic longitudinal cross-sectional view which shows the state which shrunk the main mast of the refueling machine and let the gate pass.

(First embodiment of in-furnace equipment transfer device and in-furnace equipment transfer method)
Below, 1st Embodiment of the instrument for in-furnace apparatus transfer which concerns on this invention, and the in-furnace apparatus transfer method is described with reference to drawings.

  FIG. 1 is a perspective view showing a state in which a first embodiment of an in-furnace equipment transfer device according to the present invention is extended. FIG. 2 is a perspective view showing a state in which the in-furnace apparatus transfer tool of FIG. 1 is contracted. FIG. 3 is an enlarged plan view showing a state in which the in-furnace equipment transfer tool of FIG. 1 uses the upper lattice plate as a guide.

  In the following embodiments, when the operation of the boiling water reactor is stopped, the control rod is taken out of the control rod, the fuel support bracket or the control rod guide tube by the apparatus for transferring the equipment in the reactor and transferred. Will be described as an example.

  Moreover, in each embodiment described below, the state in which the in-furnace equipment transfer device is extended is a state in which the interval between the movable bar as the movable member and the gripping tool is increased, and the in-furnace equipment transfer device. The state where the distance between the movable bar and the gripping tool is reduced.

  As shown in FIGS. 1 to 3, the in-furnace equipment transfer device 10 is suspended from, for example, an auxiliary hoist 1 of a fuel changer (not shown), and roughly includes a guide member 11 and a gripping tool 12. The Here, in the following description, the vertical direction of each part in the guide member 11 refers to the vertical direction in a state where the guide member 11 is suspended by the auxiliary hoist 1 as the second suspension means.

  The guide member 11 includes two guide sleeves 13 and 13 extending in the vertical direction in parallel to each other, and a fixed bar 14 that is horizontally stretched and fixed to a lower portion between the two guide sleeves 13 and 13. Prepare. Since the two guide sleeves 13 and 13 pass through a plurality of rectangular openings formed in the upper lattice plate 2, they are provided at intervals of diagonal lengths of the openings. A movable bar 15 as a movable member is bridged between the two guide sleeves 13 and 13 in parallel with the fixed bar 14. The gripping tool 12 is fixed by fastening a bolt to the fixed bar 14 of the guide member 11 and has a mechanism for gripping in-furnace equipment such as the control rod 6.

  The two guide sleeves 13 and 13 are formed on the sides facing each other, and guide holes 13a and 13a that open along the length (up and down) direction are formed. Guide pins 16 and 16 are fixed to both ends of the movable bar 15. These guide pins 16, 16 communicate with the guide holes 13 a, 13 a of the two guide sleeves 13, 13, and each guide pin hole 13 b extending in the vertical direction is formed by hollowing out the center of the guide sleeves 13, 13. , 13b are slidably inserted. The movable bar 15 is fixed to a central portion of the movable bar 15 by fastening a bolt with a short mounting portion 17 facing upward in the vertical direction. This attachment portion 17 is connected to the auxiliary hoist 1.

  Since the guide pins 16 and 16 move up and down in each guide hole 13a and 13a and each guide pin hole 13b and 13b, the movable bar 15 moves along the up-and-down direction of the guide sleeves 13 and 13; The relative position of the gripping tool 12 with respect to the lower end of the hoist 1 has a relationship of expanding and contracting (moving) in the vertical direction. In the following description, the guide member 11 is expanded and contracted.

  The guide sleeves 13 and 13 are respectively provided with hanging ears 18 and 18 at their upper ends. A hook of a small electric hoist 19 as a first hanging means attached to the overhead crane or the main body of the fuel changer 3 is attached to these hanging ears 18, 18.

  Further, the guide bar 16 is moved laterally in the guide pin hole 13b by some means in the guide pin hole 13b so that the movable bar 15 can be fixed without moving in the vertical direction of the guide sleeves 13, 13. There is also provided a brake device for preventing an unintended vertical (extension / contraction) operation by pressing the inner wall of 13b or by providing a brake pad-like member inside the guide pin hole 13b of the guide sleeve 13.

  Next, 1st Embodiment of the method for in-furnace apparatus transfer using the apparatus 10 for in-furnace apparatus transfer of this embodiment is described.

  FIG. 4 is a cross-sectional configuration diagram illustrating a state in which the in-furnace equipment is removed using the in-furnace equipment transfer tool of FIG. 1. FIG. 5 is a cross-sectional configuration diagram showing a state in which the in-furnace equipment is removed using the appliance for in-furnace equipment transfer shown in FIG. 1 and is stored in a temporary rack installed in the equipment storage pool. Note that the in-furnace equipment transfer method of the first embodiment shows an example in which the in-furnace equipment transfer instrument 10 is suspended from the auxiliary hoist 1.

  First, when the guide member 11 is in the contracted state shown in FIG. 2, the guide member 11 is directly attached to the auxiliary hoist 1 of the refueling machine 3 to the in-furnace equipment transfer device 10 temporarily placed on the operation floor 4 as shown in FIG. 4. Can do. Specifically, the auxiliary hoist 1 is connected to the attachment portion 17 of the in-furnace equipment transfer tool 10 on the operation floor 4.

  Next, the movable bar 15 is fixed by a brake device (not shown) to maintain the contracted state of the guide member 11, temporarily lifted by the auxiliary hoist 1, and the gripping tool 12 is immersed in the well pool 5 to check the operation. .

  After that, the hooks of the small electric hoists 19 attached to the main body of the fuel exchanger 3 (or the overhead crane) are attached to the suspension ears 18 and 18 attached to the upper ends of the guide sleeves 13 and 13, respectively. In order to be movable, the brake by the brake device is released.

  At this time, the hooks of the small electric hoists 19 (or overhead cranes) are extended and extended so that the hooks hooked on the hanging ears 18 and 18 are removed so that they do not fall suddenly due to their own weight. Then, the guide member 11 is in an extended state as shown in FIG.

  Then, after the guide member 11 is rotated by a predetermined angle in order to match the mounting angle of the handle portion of the control rod 6, the guide member 11 and the gripping tool 12 are lowered to enter the furnace.

  Further, as shown in FIG. 3, the guide member 11 passes through the rectangular opening formed in the upper lattice plate 2, the control rod 6 is taken out using the gripping tool 12, the auxiliary hoist 1 is wound up, and the control rod 6 is moved to the well pool 5. Then, the control rod 6 is transferred.

  In the transfer operation of the control rod 6, in a normal operation, the control rod 6 taken out from the furnace cannot pass over the upper beam 8 a of the equipment storage pool rack 8 installed in the equipment storage pool 7. It cannot be stored in the storage pool rack 8.

  Therefore, in the present embodiment, when the guide member 11 is outside the furnace, specifically, when the guide member 11 is exposed from the water surface, the hanging ears 18, 18 attached to the upper ends of the guide sleeves 13, 13 The movable bar 15 is lowered while the hook of the small electric hoist 19 (or the overhead crane) is hooked again to receive the load, and the relative position with the lower end of the auxiliary hoist 1 is shortened. The head is increased by fixing the position.

  As a result, the control rod 6 taken out from the furnace can be securely stored in the equipment storage pool rack 8 beyond the upper beam 8 a of the equipment storage pool rack 8.

  According to the in-furnace apparatus transfer instrument according to the present embodiment described above, the in-furnace apparatus transfer instrument 10 can be directly attached to the auxiliary hoist 1 of the fuel exchanger 3 when the guide member 11 is in a contracted state. Further, when the guide member 11 is in the extended state, the control rod 6 can be reliably grasped. When the guide member 11 is again contracted, the device storage pool rack of the device storage pool 7 in that state without removing the gripped control rod 6 on the operation floor 4 and without interfering with the rack or the like. Therefore, the removal efficiency of the control rod 6 and the efficiency of the transfer work can be greatly increased.

  Further, according to the method for transferring an in-furnace apparatus according to the present embodiment, when the in-furnace apparatus transfer instrument 10 is attached, the guide member 11 is in a contracted state, so that the attachment on the operation floor 4 is possible. Further, when the control rod 6 is taken out using the gripping tool 12, the guide rod 11 can be extended to extend the gripping tool 12 to the core support plate 27, so that the control rod 6 can be taken out reliably. Furthermore, when transferring the in-furnace equipment transfer device 10 to the equipment storage pool rack 8, the guide member 11 is in a contracted state, so that it can be reliably transferred without interfering with the gate or the rack. . As a result, the removal work efficiency and transfer work efficiency of the control rod 6 can be greatly increased.

(Second embodiment of apparatus for transferring equipment in furnace)
FIG. 6 is an enlarged plan view showing a state in which the in-furnace equipment transfer instrument according to the second embodiment of the present invention uses the upper grid plate as a guide. The same or corresponding parts as those in the first embodiment will be described using the same reference numerals.

  As shown in FIG. 6, the in-furnace equipment transfer tool 20 according to the second embodiment is formed in an X shape in plan view.

  Specifically, the guide member 21 includes four guide sleeves 23 provided at diagonal intervals passing through a plurality of rectangular openings formed in the upper lattice plate 2, and the four guide sleeves 23. A fixed bar (not shown) that is horizontally stretched over the lower portion and formed in an X shape, and a movable member that is stretched over the upper portion between the four guide sleeves 23 in parallel with the fixed bar and formed in an X shape. The movable bar 25 is provided. The gripping tool 22 is fixed by fastening a bolt to the fixed bar and has a mechanism for gripping in-furnace equipment such as the control rod 6. Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted.

  According to the in-furnace equipment transfer instrument according to the present embodiment described above, the number of guide sleeves 23 provided at intervals of diagonal lengths passing through the rectangular openings formed in the upper lattice plate 2 is four. As a result, the positioning of the guide member 21 with respect to the upper grid plate 2 can be performed more accurately.

(Second embodiment of the method for transferring equipment in the furnace)
FIG. 7 is a schematic view showing a state in which the in-furnace equipment transfer device of FIG. 1 is arranged in the vicinity of the fuel exchanger. FIG. 8 is a schematic view showing a state in which the in-furnace equipment transfer device of FIG. 1 is gripped by a fuel exchanger. FIG. 9 is a schematic view showing a state in which the refueling machine is advanced to extend the equipment for transferring equipment in the furnace. FIG. 10 is a schematic view showing a state where the main mast of the refueling machine is rotated. FIG. 11 is a schematic view showing a state in which the main mast of the refueling machine is extended. FIG. 12 is a schematic view showing a state where the main mast of the refueling machine is shrunk and passed through the gate.

  In the in-furnace equipment transfer method of this embodiment, the in-furnace equipment transfer device 10 is attached to the main mast 3a as the second suspension means of the fuel exchanger 3, and the in-furnace equipment is transferred to the spent fuel pool 9. Since it is the same as that of the said 1st Embodiment except doing, it attaches | subjects and demonstrates the same code | symbol as the said 1st Embodiment.

  First, the specific dimensional relationship of each part will be described with reference to FIG. Incidentally, FIG. 11 is selected because FIG. 11 is the drawing that most easily explains the dimensional relationship of each part.

  In FIG. 11, the length of the main mast 3a is 23453 mm, the size of the main mast 3a is 5075 mm, the size of the main mast 3a is 23453-5075 = 18376 mm, the size from the lower end of the main mast 3a to the operation floor 4 Is 1220 mm, the extension size of the main mast 3a from the operation floor 4 is 18376-1220 = 17158 mm, the size of the grapple attached to the tip of the main mast 3a is 365 mm, the deepest part of the main mast 3a from the operation floor 4 The dimension is 17158 + 365 = 17523 mm.

  The depth of the bottom of the furnace (vessel 0) is 26208 mm from the water surface (operation floor 4), and the height of the core support plate 27 is 5072 mm from the bottom of the furnace, so that 26208-5072 = 211136 mm from the water surface. Therefore, the depth 21136 mm at which the core support plate 27 is installed from the water surface is 3613 mm deeper than the dimension 17523 mm of the deepest part of the main mast 3a.

  Further, it is assumed that the dimension that the gripping tool 12 covers and grips the upper end of the control rod 6 is 457 mm, and the dimension of 457 mm protrudes from the core support plate 27. Otherwise, the upper end of the control rod 6 cannot be gripped using the gripping tool 12.

  Assuming that the control rod 6 protrudes 457 mm from the core support plate 27 as described above, the size of the gripping tool 12 is 943 mm. Therefore, subtracting 457 mm from the dimension 943 mm of the gripping tool 12 yields 486 mm.

  The required length of the guide member 11 is the dimension obtained by subtracting the dimension 943 mm of the gripping tool 12 and the dimension 17523 mm of the deepest part of the main mast 3a from the depth 21136 mm of the core support plate 27 from the water surface, that is, 21136-943-17523 = 2670 mm. It becomes.

  Further, when the dimension 943 mm of the gripping tool 12 and the length 2670 mm of the guide member 11 are added to the dimension 4400 mm of the control rod 6, it becomes 7556 mm. Then, subtracting the dimension 1220 mm from the lower end of one step of the main mast 3a to the operation floor 4 from the dimension 7556 mm obtained by adding the lengths of the gripping tool 12 and the guide member 11 to the dimension of the control rod 6 results in 6336 mm. That is, when the control rod 6 is pulled up, the lower end of the control rod 6 is at a position 6336 mm from the water surface.

  Accordingly, since the depth of the gate 30 in the spent fuel pool 9 is 7126 mm, the lower end of the control rod 6 can pass through the gate 30, and the depth of the control rod rack 31 is 8755 mm. Can be transferred from the furnace to the control rod rack 31 installed in the spent fuel pool 9 without interfering with the fuel rack 32 or the like.

  Next, based on the dimensional relationship of each part as described above, the in-furnace equipment transfer method in the present embodiment will be described. Since details of each process have already been described in the first embodiment, only an outline of each process will be described.

  First, as shown in FIG. 7, the gripping tool 12 is attached to the guide member 11, and the in-furnace equipment transfer tool 10 is assembled and installed in the forward direction of the refueling machine 3.

  Next, as shown in FIG. 8, the refueling machine 3 is moved forward and the mounting portion 17 of the guide member 11 is gripped by a grapple (not shown) of the main mast 3a.

  Then, as shown in FIG. 9, the guide member 11 of the in-furnace equipment transfer tool 10 attached to the main mast 3a is extended.

  Thereafter, as shown in FIG. 10, the fuel changer 3 is advanced to the top of the reactor core and the main mast 3 a is rotated to adjust the guide member 11 to the mounting angle of the control rod 6.

  Further, as shown in FIG. 11, the main mast 3 a is extended, and the control rod 6 is gripped by the gripping tool 12 of the in-furnace equipment transfer tool 10.

  Next, as shown in FIG. 12, the main mast 3a is contracted to raise the control rod 6, and the main mast 3a is contracted to the shortest. Then, the lower end of the control rod 6 can pass through the gate 30, and the control rod rack installed in the spent fuel pool 9 from the furnace without the control rod 6 interfering with the fuel rack 32 or the like. 31 can be reliably transferred.

  According to the method for transferring equipment in the furnace according to the present embodiment described above, when the guide member 11 is contracted, the auxiliary hoist 1 of the fuel exchanger 3 is placed on the operation hoist 4 on the operation floor 4 as in the first embodiment. The internal device transfer device 10 can be directly attached. Further, when the guide member 11 is in the extended state, the control rod 6 can be reliably grasped.

  Further, according to the present embodiment, since the main mast 3a is used, the control rod 6 can be detached from the furnace and installed at the blade guide position in the horizontal coordinate. Unloading work is also possible.

1 ... Auxiliary hoist (second suspension means)
2 ... Upper lattice plate 3 ... Fuel changer 3a ... Main mast (second suspension means)
4 ... Operation floor 6 ... Control rod 7 ... Equipment storage pool 9 ... Spent fuel pool 10 ... In-furnace equipment transfer device 11 ... Guide member 12 ... Grasping tool 13 ... Guide sleeve 14 ... Fixed bar 15 ... Movable bar (movable member) )
18 ... hanging ear 19 ... small electric hoist (first hanging means)
20 ... In-furnace equipment transfer device 21 ... Guide member 22 ... Grasping tool 25 ... Movable bar (movable member)
27 ... Core support plate 30 ... Gate 31 ... Control rod rack

Claims (4)

A guide member that is detachably suspended by a first suspension means attached to the fuel exchanger in the reactor building, and is guided by a rectangular opening formed in the upper lattice plate;
A movable member suspended by second suspension means attached to the fuel changer and movably attached along the vertical direction of the guide member;
A gripping tool fixed to the lower part of the guide member and gripping the in-furnace equipment installed on the core support plate,
When the guide member, the movable member, and the gripping tool are outside the furnace, the distance between the movable member and the gripping tool is reduced, and when the guide member, the movable member, and the gripping tool are in the furnace, A device for transferring an in-furnace apparatus, wherein a distance between the movable member and the gripping tool is increased. The guide member has two or four guide rods that can pass through the diagonal of the rectangular opening formed in the upper lattice plate,
The in-furnace equipment transfer device according to claim 1. The second suspension means is a main mast of the refueling machine;
The in-furnace equipment transfer device according to claim 1. A method for transferring in-core equipment that takes out the in-core equipment installed on the core support plate through the upper lattice plate when the reactor is shut down,
A guide member that can be guided through a rectangular opening formed in the upper lattice plate, a movable member that is movably attached along the vertical direction of the guide member, and a gripping tool fixed to the lower portion of the guide member. When the in-furnace equipment transfer device is outside the furnace, the guide member and the movable member are attached to the refueling machine by reducing the distance between the movable member and the gripping tool. A suspension step for respectively suspending,
After the suspending step, when the guide member, the movable member, and the gripping tool are suspended in the furnace, the interval between the movable member and the gripping tool is increased to form a quadrangle formed on the upper lattice plate. A passing step for passing through the opening;
A gripping step of gripping the in-furnace device with the gripper after the passing step;
After the gripping step, a step of taking out the in-furnace equipment by pulling up the second suspension means;
A transfer step of transferring the in-furnace equipment to various pools after the removal step;
A method for transferring equipment in a furnace, comprising:

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